The first test of the policy of containment was

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The first test of the policy of containment was the North Korean invasion of South Korea in 1950. The United States, under the Truman administration, responded by sending troops to aid the South Koreans, and the conflict became known as the Korean War. This was seen as a test of the policy of containment as the United States was attempting to prevent the spread of communism by limiting North Korea's aggression towards the South.

The First Test of the Policy of Containment Was